/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * arch/arm/src/armv7-m/up_copyarmstate.c
 *
 *   Copyright (C) 2009, 2011, 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <stdint.h>

#include <arch/irq.h>

#include "up_internal.h"

#if defined(CONFIG_ARCH_FPU) && !defined(CONFIG_ARM_CMNVECTOR)

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_copyarmstate
 *
 * Description:
 *    Copy the ARM portion of the register save area (omitting the floating
 *    point registers) and save the floating pointer register directly.
 *
 ****************************************************************************/

void up_copyarmstate(uint32_t *dest, uint32_t *src)
{
	int i;

	/* In the Cortex-M3 model, the state is copied from the stack to the TCB,
	 * but only a reference is passed to get the state from the TCB.  So the
	 * following check avoids copying the TCB save area onto itself:
	 */

	if (src != dest) {
		/* Save the floating point registers: This will initialize the floating
		 * registers at indices SW_INT_REGS through (SW_INT_REGS+SW_FPU_REGS-1)
		 */

		up_savefpu(dest);

		/* Save the block of ARM registers that were saved by the interrupt
		 * handling logic.  Indices: 0 through (SW_INT_REGS-1).
		 */

		for (i = 0; i < SW_INT_REGS; i++) {
			*dest++ = *src++;
		}

		/* Skip over the floating point registers and save the block of ARM
		 * registers that were saved by the hardware when the interrupt was
		 * taken.  Indices: (SW_INT_REGS+SW_FPU_REGS) through
		 * (XCPTCONTEXT_REGS-1)
		 */

		src += SW_FPU_REGS;
		dest += SW_FPU_REGS;

		for (i = 0; i < HW_XCPT_REGS; i++) {
			*dest++ = *src++;
		}
	}
}

#endif							/* CONFIG_ARCH_FPU && !CONFIG_ARM_CMNVECTOR */
